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Focusing of singular beams

  • Physical and Quantum Optics
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Abstract

The process of focusing of an inhomogeneously polarized beam passed through a system consisting of a uniaxial crystal and a polarization filter is considered. It is shown that the action of this system is equivalent to the action of a phase transparency with a complex relief of the refractive index. In particular, if the angle between the axes of the quarter-wave plate and the polarizer is equal to 45°, this transparency has a helicoidal relief. Simultaneously, two singular beams with different curvatures of their wavefronts arise in the transparency. The action of the lens consists in formation of a combined singular beam having three focal waists. The boundary wave arising upon focusing is able not only to form a new spectrum of toroidal vortices, but also to straighten the focusing region, forming a fairly extended range with a weak divergence.

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Authors and Affiliations

  1. Simferopol State University, Simferopol, 95007, Ukraine

    A. V. Volyar & T. A. Fadeeva

Authors
  1. A. V. Volyar
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  2. T. A. Fadeeva
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Additional information

Translated from Optika i Spektroskopiya, Vol. 96, No. 1, 2004, pp. 107–116.

Original Russian Text Copyright © 2004 by Volyar, Fadeeva.

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Volyar, A.V., Fadeeva, T.A. Focusing of singular beams. Opt. Spectrosc. 96, 96–105 (2004). https://doi.org/10.1134/1.1643993

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  • DOI: https://doi.org/10.1134/1.1643993

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